<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			body{
				background-color: #040D15;
				padding: 0;
				margin: 0;
				
			}
			a{
				text-decoration: none;
				position: absolute;
				left: 50%;
				top: 50%;
				transform: translate(-50%,-50%);
				width: 200px;
				height: 60px;
				text-align: center;
				background: linear-gradient(90deg,#ff5500,#ff557f,#ff55ff);
				background-size: 400%;
				border-radius: 20px;
				line-height: 60px;
				color: #fff;
				text-transform: uppercase;
				letter-spacing: 2px;
				z-index: 1;
			}
			a::before{
				content: "";
				position: absolute;
				background: linear-gradient(90deg,#ff5500,#ff557f,#ff55ff);
				background-size: 400%;
				left: -5px;
				top: -5px;
				bottom: -5px;
				right: -5px;
				border-radius: 20px;
				opacity: 0;
				z-index: -1;
				transition: 0.5s;
			}
			a:hover::before{
				filter: blur(20px);
				opacity: 1;
				animation: anim 8s linear infinite;
			}
			@keyframes anim{
				from{
					background-position: 0%;
				}
				to{background-position: 400%;}
			}
		</style>
	</head>
	<body>
		<a href="#">button</a>
		
	</body>
</html>
